Just do it alone, that's best for you and your friendship with other. And if you are bet on individual irrespective of others choice and then gather around only to watch the game or to see who won the game then its good but when you all are betting on one together then someone will have to take the blame if you lose the bet. We can say we don't like that and we all share the responsibility among everyone but that's not the reality and that's why there's always misunderstanding happens even between the close partners.
That's all true, but nevertheless, friendly communication is full of disputes, when everyone proves that his opinion is absolutely correct and often in this way one friend can persuade another to his opinion, but this does not prevent the latter from later accusing him of literally forcing his bet on him.
Because we know that we may all be serious adults, but our conscience works in such a way that we always look for someone to blame other than ourselves.
And even though such cases are few, it is nevertheless always unpleasant when someone tells you that he had his own opinion, but decided to listen to you, and because of this he lost money.